CN111220620A - Machine visual appearance flaw detection device and flaw detection method thereof - Google Patents
Machine visual appearance flaw detection device and flaw detection method thereof Download PDFInfo
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- CN111220620A CN111220620A CN202010158743.7A CN202010158743A CN111220620A CN 111220620 A CN111220620 A CN 111220620A CN 202010158743 A CN202010158743 A CN 202010158743A CN 111220620 A CN111220620 A CN 111220620A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention belongs to the field of machine vision detection and measurement and equipment clamping, and discloses a machine vision appearance flaw detection device, which comprises: the invention utilizes the fixed detection device, the lens and the light source, changes the position of a product and the relative angle between the product and the light source through the rotating shaft, and has simple structure, no limitation of the detection effect on the angle of the light source, high adjustment precision and good universality.
Description
Technical Field
The invention belongs to the field of machine vision detection and measurement and equipment clamping, and particularly relates to a machine vision appearance flaw detection device and a flaw detection method thereof.
Background
Imperfections in the appearance of the product, such as: dirty spots, scratches, cracks, etc., are key quality issues; the detection of the appearance defects of the product is an essential step in the manufacturing process. The step is realized by manual visual inspection or an automatic machine vision inspection device instead of human eyes. The flaw of the product is detected by an automatic machine vision detection device, and the core technology is to clearly image the flaw by designing a light path according to the characteristics of the flaw.
The current common way on the market is to fix the product and then change the light path by changing the mounting angle of the LED particles in the light source, for example: 0 degree light, 45 degree light, parallel light, etc., and has the disadvantage that the fixing manner of the LED particles is soldering, and once the LED particles are soldered, the angle is fixed and cannot be changed. If the product has 10 defects, 10 light paths with different angles are respectively needed to be clearly imaged, 10 light sources are installed on the machine vision appearance detection device, and the defects are as follows: the structure is complicated, the light path adjusting angle is limited by the type of the light source, the adjusting precision is low, and the universality is poor.
Disclosure of Invention
The invention provides a machine vision appearance flaw detection device and a flaw detection method thereof, and aims to solve the problems that a detection device in the prior art is complex in structure, low in precision and poor in universality.
In order to solve the above technical problem, the present invention provides a device for detecting machine vision defects, comprising: the device comprises a mounting bracket, a detection device, a light source device, a clamping device and an adjusting device, wherein the mounting bracket is connected with a fixing frame, the monitoring device is mounted on the fixing frame, the light source device is arranged opposite to the monitoring device, and the light source device is connected with the mounting bracket; the clamping device and the detection device are correspondingly arranged, the clamping device is connected with a rotating shaft, and the other end of the rotating shaft is connected to the adjusting device.
Preferably, the light source device comprises an annular LED light source.
Preferably, a height which can enable the clamping device to rotate for one circle is reserved between the clamping device and the light source device.
Preferably, the clamping device is provided as one or more clasps.
Preferably, the clamping means is provided as one or more suction cups.
Preferably, the adjusting device is movable in a plane parallel to the observation plane of the detecting device.
Preferably, the adjusting device can move freely any distance in the normal direction of the observation plane of the detecting device.
Based on a machine vision appearance flaw detection device, the invention also discloses a machine vision appearance flaw detection method, which comprises the following steps:
s1, fixing the object on the clamping device by selecting a suction nozzle or a clamp according to the characteristics of the object;
and S2, moving the detected object to the detection range of the detection device by adjusting the adjusting device.
And S3, the rotating shaft rotates at any angle, and stops rotating when the target detection area of the detected object is present in the detection range of the detection device.
S4, the rotating shaft rotates slightly to change the relative angle between the surface of the detected object and the light source device, so as to change the angle of the incident light to the target detection area of the detected object and the angle of the reflected light from the target detection area of the detected object, change the imaging effect of the target detection area of the detected object and find the optimal imaging angle;
and S5, the adjusting device adjusts the distance between the detected object and the detection device in the normal direction of the observation plane, and the focusing of the target detection area is realized.
S6, the detection device carries out shooting detection, and after the detection is finished, the adjusting device is adjusted to move the detected object to the position where the rotating shaft stops rotating in the step S3, and the rotating shaft returns to the angle where the rotating shaft stops rotating in the step S3;
s7, repeating the steps S3-S6 until the rotation axis rotates 360 °;
and S8, replacing the detected surface with a fixed surface, and repeating the steps S1-S7 to complete the overall detection of the detected object.
And S9, recording the corresponding position relation of each flaw in each detection range in each rotation angle to form a complete appearance flaw imaging process.
Preferably, the rotating shaft can rotate by 360 degrees, and the angular stepping precision is 0.5 degrees.
The invention provides a machine vision appearance flaw detection device and a flaw detection method thereof, wherein the device comprises: the invention utilizes the fixed detection device, the lens and the light source, changes the position of a product and the relative angle between the product and the light source through the rotating shaft, and has simple structure, high detection effect and adjustment precision and good universality, and is not limited by the angle of the light source.
Drawings
FIG. 1 is a schematic structural diagram of a device for detecting visual appearance defects of a machine according to an embodiment of the present invention;
FIG. 2 is a schematic view of a clamping device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a clamping device according to an embodiment of the present invention.
Wherein, 1, installing a bracket; 2. a fixed mount; 3. a detection device; 4. a rotating shaft; 5. a light source device; 6. an object to be detected; 7. a clamping device; 8. an adjustment device; 71. a suction cup; 72. and (5) carrying.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, a machine vision appearance flaw detection apparatus 3 according to a preferred embodiment of the present invention is characterized by including: the device comprises a mounting bracket 1, a detection device 3, a light source device 5, a clamping device 7 and an adjusting device 8, wherein the mounting bracket 1 is connected with a fixing frame 2, the monitoring device is mounted on the fixing frame 2, the light source device 5 is arranged opposite to the monitoring device, and the light source device 5 is connected with the mounting bracket 1; clamping device 7 corresponds the setting with detection device 3, and clamping device 7 is connected with rotation axis 4, and the other end of pivot is connected on adjusting device 8, utilizes fixed detection device 3, camera lens and light source, changes the position of product and with the relative angle of light source through rotation axis 4, simple structure, detection effect do not receive the light source angle restriction, adjustment accuracy is high, the commonality is good.
Preferably, the light source device 5 is provided as an LED light source.
Preferably, a height is left between the clamping device 7 and the light source device 5, which enables the clamping device 7 to rotate one circle.
As shown in fig. 2, as a preferred embodiment of the present invention, the holding means 7 is provided as one or more clasps 72.
As shown in fig. 3, as a preferred embodiment of the present invention, the holding means 7 is provided as one or more suction cups 71.
Preferably, the adjustment device 8 is freely movable in a plane parallel to the observation plane of the detection device 3.
Preferably, the adjusting device 8 can be moved freely by any distance in the direction of the normal of the observation plane of the detecting device 3.
Based on a machine vision appearance flaw detection device, the invention also discloses a machine vision appearance flaw detection method, which comprises the following steps:
s1, fixing the object on the clamping device 7 by selecting a suction nozzle or a clamp according to the characteristics of the object;
s2, the adjusting device 8 is adjusted to move the object 6 to the detection range of the detecting device 3, the adjusting device 8 clamps the object 6, and the position in space can be represented by the coordinates of the space coordinate system with the three axis limit points of the clamping device 7 as the origin, which is denoted as (x, y, z).
S3, the rotating shaft 4 rotates at any angle, when the target detection area of the detected object 6 is within the detection range of the detection device 3, the rotating shaft 4 stops rotating, and the rotation angle of the rotating shaft 4 can be represented by θ.
S4, the rotation shaft 4 is rotated by a fine motion to change the relative angle between the surface of the detected object 6 and the light source device 5, thereby changing the angle of the incident light to the target detection area of the detected object 6 and the angle of the reflected light from the target detection area of the detected object 6, so as to change the imaging effect of the target detection area of the detected object 6 and find the optimum imaging angle.
And S5, the adjusting device 8 adjusts the distance between the detected object 6 and the detecting device 3 in the normal direction of the observation plane, and the focusing on the target detection area is realized. At this time, the position of the flaw may be recorded according to the spatial coordinates (x, y, z) and the size of θ.
S6, the detecting device 3 performs the shooting detection, and after the detection is completed, the adjusting device 8 moves the detected object 6 to the position where the rotation shaft 4 stops rotating in step S3, and the rotation shaft returns to the angle where the rotation shaft stops rotating in step S3;
s7, repeating the steps S3-S6 until the rotation shaft 4 rotates 360 °;
and S8, replacing the detected surface with a fixed surface, and repeating the steps S1-S7 to complete the overall detection of the detected object.
And S9, recording the corresponding position relation of each defect in each detection range at any rotation angle, and forming a complete appearance defect imaging process.
Preferably, the rotation axis 4 is rotatable by 360 ° with an angular step precision of 0.5 °.
In summary, in order to overcome the defects of the prior art, such as complicated structure, limited light path adjustment angle by the type of light source, low adjustment precision, and poor versatility, the present invention aims to provide a device 3 for detecting machine vision appearance defects and a method for adjusting light path thereof. The embodiment of the invention provides a machine vision appearance flaw detection device 3, which comprises a fixed detection device, a lens and a light source, wherein the position of a product and the relative angle between the product and the light source are changed through a light path adjusting mechanism, and the machine vision appearance flaw detection device comprises: the device comprises a mounting bracket 1, a detection device 3, a light source device 5, a clamping device 7 and an adjusting device 8, wherein the mounting bracket 1 is connected with a fixing frame 2, the monitoring device is mounted on the fixing frame 2, the light source device 5 is arranged opposite to the monitoring device, and the light source device 5 is connected with the mounting bracket 1; compared with the prior art, the invention has the following outstanding advantages and effects that the clamping device 7 is arranged corresponding to the detection device 3, the clamping device 7 is connected with the rotating shaft 4, and the other end of the rotating shaft is connected with the adjusting device 8: simple structure, adjustable light path with any angle, high adjustment precision and good universality.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for persons skilled in the art, numerous modifications and substitutions can be made without departing from the counting principle of the present invention, and these modifications and substitutions should also be considered as the protection scope of the present invention.
Claims (9)
1. A machine vision appearance flaw detection apparatus (3), comprising: the device comprises a mounting bracket (1), a detection device (3), a light source device (5), a clamping device (7) and an adjusting device (8), wherein the mounting bracket (1) is connected with a fixing frame (2), the monitoring device is mounted on the fixing frame (2), the light source device (5) is arranged opposite to the monitoring device, and the light source device (5) is connected with the mounting bracket (1); clamping device (7) with detection device (3) correspond the setting, just clamping device (7) are connected with rotation axis (4), the other end of pivot is connected on adjusting device (8).
2. A machine vision appearance flaw detection device (3) according to claim 1, wherein the light source device (5) comprises an annular LED light source.
3. A machine vision defect inspection device (3) according to claim 1, characterized in that a height is left between the holding device (7) and the light source device (5) to allow the holding device (7) to rotate one turn.
4. A machine vision blemish detection device (3) according to claim 1, characterized in that said gripping means (7) are provided as one or more clasps (72).
5. A machine vision blemish detection device (3) according to claim 1, characterized in that said gripping means (7) are provided as one or more suction cups (71).
6. A machine vision appearance imperfection detection apparatus (3) as claimed in claim 1, wherein said adjustment means (8) is movable arbitrarily in a plane parallel to a viewing plane of said detection apparatus (3).
7. A machine vision appearance imperfection detection apparatus (3) as claimed in claim 1, wherein said adjustment means (8) is movable at will an arbitrary distance in a direction normal to the viewing plane of the detection means (3).
8. A defect detection method based on the machine vision appearance defect detection device (3) of claims 1-7, the method comprising:
s1, fixing the object on the clamping device (7) in a manner of selecting a suction nozzle or a clamp according to the characteristics of the object;
and S2, moving the detected object (6) to the detection range of the detection device (3) by adjusting the adjusting device (8).
And S3, the rotating shaft (4) rotates at any angle, and when the target detection area of the detected object (6) appears in the detection range of the detection device (3), the rotating shaft (4) stops rotating.
S4, the rotating shaft (4) performs micro-motion rotation to change the relative angle between the surface of the detected object (6) and the light source device (5), so as to change the angle of incident light to the target detection area of the detected object (6) and the angle of reflected light from the target detection area of the detected object (6), so as to change the imaging effect of the target detection area of the detected object (6) and find the optimal imaging angle;
and S5, the adjusting device (8) adjusts the distance between the detected object (6) and the detecting device (3) in the normal direction of the observation plane, and the focusing on the target detection area is realized.
S6, the detection device (3) carries out shooting detection, after the detection is finished, the adjusting device (8) is adjusted to move the detected object (6) to the position where the rotating shaft (4) stops rotating in the step S3, and the rotating shaft (4) returns to the angle where the rotating shaft stops rotating in the step S3;
s7, repeating steps S3-S6 until the rotation shaft (4) rotates 360 °;
and S8, replacing the detected surface with a fixed surface, and repeating the steps S1-S7 to complete the overall detection of the detected object.
And S9, recording the corresponding position relation of each flaw in each detection range in each rotation angle to form a complete appearance flaw imaging process.
9. The machine vision appearance flaw detection method according to claim 8, based on the machine vision appearance flaw detection device (3) of claim 1 to 7, characterized in that the rotation axis (4) can be rotated by 360 ° with an angular stepping accuracy of 0.5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010158743.7A CN111220620A (en) | 2020-03-09 | 2020-03-09 | Machine visual appearance flaw detection device and flaw detection method thereof |
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| CN202010158743.7A CN111220620A (en) | 2020-03-09 | 2020-03-09 | Machine visual appearance flaw detection device and flaw detection method thereof |
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| CN114101125A (en) * | 2022-01-24 | 2022-03-01 | 河北金环模具有限公司 | Overturning platform for processing die and workpiece |
| CN114113098A (en) * | 2020-08-27 | 2022-03-01 | 泰科电子(上海)有限公司 | Visual detection device for connector |
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